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New Customers Per Day
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- senior
Problem
For each calendar date, how many customers placed their very first order on that day? A customer's first-order date is the earliest order they have in the table.
Practice This Problem
Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.